An object travels 4/5 miles in one half hours what is his spead in one hour

If you would like to know how much does the object travel in one hour, you can calculate this using the following steps:

4/5 miles ... half an hour = 30 minutes
x miles = ? ... one hour = 60 minutes

4/5 * 60 = 30 * x     /30
x = 4/5 * 60 / 30
x = 4/5 * 2
x = 8/5 = 1 3/5 miles

The correct result would be 1 3/5 miles in one hour.